SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (10): 1679-1684.DOI: 10.1016/j.cjche.2015.07.027

• 化工热力学 • 上一篇    下一篇

Intradiffusion, density and viscosity studies in binary liquid systems of acetylacetone + DMF/DMSO/benzene at 303.15 K and 333.15 K

Xiaojuan Chen1, Zhaoxun Lian2, Haimin Zhong1, Liuping Chen1   

  1. 1 School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China;
    2 School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China
  • 收稿日期:2014-12-11 修回日期:2015-07-05 出版日期:2015-10-28 发布日期:2015-11-27
  • 通讯作者: Liuping Chen

Intradiffusion, density and viscosity studies in binary liquid systems of acetylacetone + DMF/DMSO/benzene at 303.15 K and 333.15 K

Xiaojuan Chen1, Zhaoxun Lian2, Haimin Zhong1, Liuping Chen1   

  1. 1 School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China;
    2 School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China
  • Received:2014-12-11 Revised:2015-07-05 Online:2015-10-28 Published:2015-11-27

摘要: Intradiffusion coefficients of acetylacetone (AcAc) and DMF/DMSO/benzene in binary systems over the entire concentration range at 303.15 K were determined by 1H diffusion-order spectroscopy (DOSY) nuclear magnetic resonance (NMR)method based pulse field gradient (PFG). The densities and viscosities of the above three binary systemsat 303.15 Kwere also studied andemployed to calculate the excessmolar volumes (VE) and deviations in viscosity (Δη). Besides, experiments were carried out at 333.15 K for the systemof AcAc+DMF. The solvent and temperature effect upon the difference in D between enol and keto tautomers, the tautomeric equilibrium and excess properties (VE and Δη) were discussed as well. Isotherms of VE as a function of mole fraction of AcAc (x1) show positive deviations in benzene but negative deviations in DMF and DMSO, whereas isotherms of Δη as a function of x1 record positive deviations in DMF but negative in benzene and DMSO. VE values show more negative and Δη values are less positive in the system of AcAc + DMF at 333.15 K compared to 303.15 K. The VE and Δη were fitted to a Redlich-Kister type equation and the measured results were interpreted concerning molecular interactions in the solutions.

关键词: Intradiffusion coefficient, Density, Viscosity, Acetylacetone, 1H DOSY PFG NMR method

Abstract: Intradiffusion coefficients of acetylacetone (AcAc) and DMF/DMSO/benzene in binary systems over the entire concentration range at 303.15 K were determined by 1H diffusion-order spectroscopy (DOSY) nuclear magnetic resonance (NMR)method based pulse field gradient (PFG). The densities and viscosities of the above three binary systemsat 303.15 Kwere also studied andemployed to calculate the excessmolar volumes (VE) and deviations in viscosity (Δη). Besides, experiments were carried out at 333.15 K for the systemof AcAc+DMF. The solvent and temperature effect upon the difference in D between enol and keto tautomers, the tautomeric equilibrium and excess properties (VE and Δη) were discussed as well. Isotherms of VE as a function of mole fraction of AcAc (x1) show positive deviations in benzene but negative deviations in DMF and DMSO, whereas isotherms of Δη as a function of x1 record positive deviations in DMF but negative in benzene and DMSO. VE values show more negative and Δη values are less positive in the system of AcAc + DMF at 333.15 K compared to 303.15 K. The VE and Δη were fitted to a Redlich-Kister type equation and the measured results were interpreted concerning molecular interactions in the solutions.

Key words: Intradiffusion coefficient, Density, Viscosity, Acetylacetone, 1H DOSY PFG NMR method